Calcination is the process of heating a solid compound to a temperature that is under its melting point in
a low oxygen environment. The purpose of this is to remove impurities, volatile substances, or to
thermally decompose the material. This allows a wide range of feed materials. The most common feed
material is calcium carbonate, also known as limestone. The combination of high temperature and
reduced oxygen allows the removal of carbon in the form of CO2, resulting in a product of calcium oxide
(lime). This same process can be used for other carbonate-to-oxide reactions such as zinc, copper, and
iron carbonates. Other examples include removing water of crystallization (gypsum), treating volatiles
from petroleum coke, phase transformations of glass materials, and more. Some examples that Vulcan®
Drying Systems has had personal experience with are removing water of crystallization from alumina for
catalyst production, drying kaolin for paper production, removing volatiles from spent activated carbon
for absorption columns, and removing mercury from cement kiln dust.
Vulcan® Drying Systems offers calcining processes with a unit designed around an indirect fired drum.
This system can include a feed hopper, live bottom feeder, feed conveyors, rotary drum with burners,
and cooling auger with spray manifold. Air pollutants can be controlled via vapor scrubbers and a
thermal oxidizer if needed. Our systems provide a low oxygen environment using airlock valves, seal
bellows, and a kiln steam spray. Our units are designed for each customer’s specific needs. This allows
us to give you a properly sized system and allows for designing around future bottlenecks. Vulcan®
Drying Systems are cost effective, efficient, and easy to operate. Contact Vulcan® for a free quote or for
any questions you may have.
The article below gives a more in depth look into the calcination process of limestone, which includes
the chemical reactions involved, kiln types and capacities, and storage and handling.
Related Article: https://www.ispatguru.com/calcination-of-limestone/